Football Analytics The CIES Football Observatory 2017/18 ...

Football Analytics The CIES Football Observatory 2017/18 season

Drs. Raffaele Poli, Roger Besson and Lo?c Ravenel June 2018

Table of contents

Foreword.................................................................................................... 1 Demographic trends in the European football........................................... 3 Is there an optimum squad age to win in football?.................................. 11 A comparative analysis of club-trained players....................................... 17 The importance of squad stability............................................................ 25 World football expatriates: a global study............................................... 31 2018 FIFA World CupTM: profile of qualified teams................................ 39 Demography of five major women's football leagues............................. 47 Performance and playing styles across Europe........................................ 53 How to evaluate player performance?..................................................... 63 Transfer market analysis: tracking the money......................................... 73 The transfer of footballers: a network analysis........................................ 83 How to evaluate a football player's transfer value?................................. 95

Foreword

Football offers incredibly interesting possibilities to when it comes to datadriven analysis. This e-book regroups the Monthly Reports published by the CIES Football Observatory over the course of the 2017/18 season. Two research notes are also included. The contents mainly relate to our three key areas of expertise: the demography study of the players' labour market, the analysis of the technical performance of both teams and players, as well as the economic study of the transfer market.

Dissemination was always at the heart of our approach. For ten years, we have published printed annual studies. These publications ceased in 2014 in favour of monthly and weekly digital reports. This step helped us to share our findings with an even greater audience. Up until the end of 2017, these publications were accessed about two million times. This number is growing week after week alongside the establishment of the CIES Football Observatory as a key reference in the football research area.

This e-book is a complementary attempt to reach people who are passionate about football. We firmly believe that our analysis is a precious tool to help the general public improve its knowledge of the beautiful game. Making fans aware of the multiple stakes at play in today's football is a source of great satisfaction. This e-book is an additional way of allowing us to fulfil our mission at the service of football's sustainable and long-term development.

The key mission of our research group is to advance the frontiers of knowledge on football at large. This includes, but it is not limited to, the critical observation of the problems affecting the beautiful game with a governance and regulation purpose, the understanding of the logics and dynamics of success, as well as the implementation of both conceptual and technical tools to improve squad management and organisational performance.

In our daily work, we aim to analyse football in both a relevant and accessible fashion. Often, the simple description of the phenomena studied and the appraisal of the general context in which they occur provide crucial insights to understand football in its complexity. We also believe that the unique comparative perspective promoted by our research group

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